Weeratian TawanwongsriPenpun WattanakraiFaculty of Medicine, Ramathibodi Hospital, Mahidol University2020-01-272020-01-272019-01-01Case Reports in Dermatology. Vol.11, No.1 (2019), 40-47166265672-s2.0-85061669081https://repository.li.mahidol.ac.th/handle/20.500.14594/52143© 2019 The Author(s). We, hereby, report two cases of serum sickness in adult male identical twins who had received equine rabies immunoglobulin as a postexposure rabies treatment after cat scratches. The younger brother developed low-grade fever, polyarthritis, and multiple erythematous maculopapular eruptions, whereas low-grade fever and urticaria-like eruptions were detected in the elder brother. Both patients received a 7-day course of low-dose prednisolone and achieved good responses without recurrent attacks.Mahidol UniversityMedicineArticleSCOPUS10.1159/000497053